EN
When researching Slavic tribal names, we may come across several tribes with two names based on one and the same root. This concerns, inter alia, also ethnonym Slav/Slavon. The names with the suffix -jane/-ěne, from Proto-Slavic *-ēn-, coexist with the other names, which are mostly autodenomination, and patronymic ones, however, they are not always derived from the latter names and they cannot mostly refer to a place. The assumption of analogies to Moravian-type ethnonyms, which were the most common in medieval times, is not fully justified, since the age of the records suggests that the records with the suffix *- ēnare as old or in several cases even older than those without it (e.g. *Tuchorěne, known as early as the 10th century, is recorded as *Tuchori only in the second half of the 11th century). In the light of this fact, the suffix *-ēn- must be reinterpreted.